一般的(いっぱんてきに)に日本人は集団行動しているので、ほとんどのアメリカ人には日本人の考え方が理解できない。Because Japanese typically act in a collective manner, it's difficult for Americans to understand the Japanese mind.

Notes:

集団行動 can also be used simply as a noun. For example, I pulled the example from my friend's journal, in which she wrote 集団行動が苦手, "I'm not very good with collective behavior. (which I find a bit ironic, being she is Japanese).

彼女に「３ヶ月浮気（うわき）してるよ」と言ったら、ビンタされた。When I told my girlfriend I've been cheating on her for three months, she slapped me across the face.

Notes:ビンタする is only used in a very particular context: when a woman slaps a man across the face (once or twice). For other means of slapping, you can use ひっぱたく, which is a slap to the face for both genders, and たたく, which is the more universal/flexible slap/pat.